Oil and moisture absorbent material and food package

Abstract

A oil and moisture absorbent material suitable for use in food packages and a food package made of such material. The material comprises an oil and moisture absorbent layer covered by an oil and moisture repellent substance that has a multiplicity of perforations or which is applied in a pattern so that oil and moisture can pass through. Alternatively, the oil and moisture absorbent layer may be covered by an oil and moisture permeable substance. The oil and moisture absorbent layer may have indentations and additives that improve its oil and moisture absorbency. The oil and moisture absorbent layer may be made of a paperboard that is manufactured using a reduced level of calendering and having a reduced amount of sizing applied.

What is claimed is:  
     
         1 . A material suitable for use in food packages, the material comprising: 
 a first layer comprising an oil and moisture absorbent substance and    a second layer covering a top surface of the first layer, the second layer comprising an oil and moisture repellent substance having a multiplicity of perforations to allow oil and moisture to pass through the second layer.    
     
     
         2 . The material of  claim 1 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         3 . The material of  claim 1 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         4 . The material of  claim 1 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         5 . The material of  claim 4 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         6 . The material of  claim 4 , wherein the paperboard has a Hercules Sizing Test value of not more than about 350 seconds.  
     
     
         7 . The material of  claim 4 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         8 . The material of  claim 4 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         9 . The material of  claim 4 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         10 . The material of  claim 1 , wherein the second layer is a polymer film.  
     
     
         11 . The material of  claim 10 , wherein the polymer comprises a blend of polymers.  
     
     
         12 . The material of  claim 10 , wherein the polymer comprises a low density polyethylene.  
     
     
         13 . The material of  claim 1  wherein the multiplicity of perforations is created using a knurled roll.  
     
     
         14 . A material suitable for use in food packages, the material comprising: 
 a first layer comprising an oil and moisture absorbent substance and    a second layer comprising an oil and moisture repellent substance, the second layer covering a first region of a top surface of the first layer while not covering a second region of the top surface of the first layer so that oil and moisture can pass through the second region to the first layer.    
     
     
         15 . The material of  claim 14 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         16 . The material of  claim 14 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         17 . The material of  claim 14 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         18 . The material of  claim 17  wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         19 . The material of  claim 17  wherein the paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         20 . The material of  claim 17 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         21 . The material of  claim 17 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         22 . The material of  claim 17 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         23 . The material of  claim 14 , wherein the oil and moisture repellent substance comprises an aqueous coating.  
     
     
         24 . The material of  claim 23 , wherein the aqueous coating comprises an emulsified acrylic-containing polymer.  
     
     
         25 . A material suitable for use in food packages, the material comprising: 
 a first layer comprising an oil and moisture absorbent substance and    a second layer covering a top surface of the first layer, the second layer comprising an oil and moisture permeable substance.    
     
     
         26 . The material of  claim 25 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         27 . The material of  claim 25 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         28 . The material of  claim 25 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         29 . The material of  claim 28  wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         30 . The material of  claim 28  wherein the paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         31 . The material of  claim 28 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         32 . The material of  claim 28 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         33 . The material of  claim 28 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         34 . The material of  claim 25 , wherein the oil and moisture permeable substance comprises an aqueous coating.  
     
     
         35 . The material of  claim 34 , wherein the aqueous coating comprises an emulsified vinyl chloride-containing polymer.  
     
     
         36 . A material suitable for use in food packages, the material comprising: 
 a first layer comprising an oil and moisture absorbent substance and    a second layer covering a top surface of the first layer, the second layer comprising a formulated olefinic polymer.    
     
     
         37 . The material of  claim 36 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         38 . The material of  claim 36 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         39 . The material of  claim 36 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         40 . The material of  claim 39 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         41 . The material of  claim 39 , wherein the paperboard has a Hercules Sizing Test value of not more than about 350 seconds.  
     
     
         42 . The material of  claim 39 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         43 . The material of  claim 39 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         44 . The material of  claim 39 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         45 . The material of  claim 36 , wherein the second layer comprises a film.  
     
     
         46 . The material of  claim 36 , wherein the second layer comprises an open celled foam structure.  
     
     
         47 . The material of  claim 36 , wherein the formulated olefinic polymer comprises a blend of formulated olefinic polymers.  
     
     
         48 . The material of  claim 36 , wherein the formulated olefinic polymer is blended with a low density polyethylene.  
     
     
         49 . A food package comprising: 
 a body portion and    a bottom portion having: 
 a first layer comprising an oil and moisture absorbent substance and  
 a second layer covering a top surface of the first layer, the second layer comprising an oil and moisture repellent substance having a multiplicity of perforations to allow oil and moisture to pass from the second layer to the first layer.  
   
     
     
         50 . The food package of  claim 49 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         51 . The food package of  claim 49 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         52 . The food package of  claim 49 , wherein the first layer is paperboard.  
     
     
         53 . The food package of  claim 52 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         54 . The food package of  claim 52 , wherein the paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         55 . The food package of  claim 52 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         56 . The food package of  claim 52 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         57 . The food package of  claim 52 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         58 . The food package of  claim 49 , wherein the second layer is a polymer film  
     
     
         59 . The food package of  claim 58 , wherein the polymer comprises a blend of polymers.  
     
     
         60 . The food package of  claim 58 , wherein the polymer is a low density polyethylene.  
     
     
         61 . The food package of  claim 49 , wherein the multiplicity of perforations is created using a knurled roll.  
     
     
         62 . A food package comprising: 
 a body portion and    a bottom portion having: 
 a first layer comprising an oil and moisture absorbent substance and  
 a second layer comprising an oil and moisture repellent substance, the second layer covering a first region of a top surface of the first layer while not covering a second region of the top surface of the first layer so that oil and moisture can pass through the second region to the first layer.  
   
     
     
         63 . The food package of  claim 62 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         64 . The food package of  claim 62 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         65 . The food package of  claim 62 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         66 . The food package of  claim 65 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         67 . The food package of  claim 65 , wherein the oil and moisture absorbent paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         68 . The food package of  claim 65 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         69 . The food package of  claim 65 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         70 . The food package of  claim 65 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         71 . The food package of  claim 62 , wherein the oil and moisture repellent substance comprises an aqueous coating.  
     
     
         72 . The material of  claim 71 , wherein the aqueous coating comprises an emulsified acrylic-containing polymer  
     
     
         73 . A food package comprising: 
 a body portion and    a bottom portion having: 
 a first layer comprising an oil and moisture absorbent substance and  
 a second layer covering a top surface of the first layer, the second layer comprising an oil and moisture permeable substance.  
   
     
     
         74 . The food package of  claim 73 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         75 . The food package of  claim 73 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         76 . The food package of  claim 73 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         77 . The food package of  claim 76 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         78 . The food package of  claim 76 , wherein the paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         79 . The food package of  claim 76 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         80 . The food package of  claim 76 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         81 . The food package of  claim 76 , wherein the paperboard has indentations to increase the moisture absorbency of the paperboard.  
     
     
         82 . The material food package of  claim 73 , wherein the oil and moisture permeable substance comprises an aqueous coating.  
     
     
         83 . The material of  claim 82 , wherein the aqueous coating comprises an emulsified vinyl chloride-containing polymer.  
     
     
         84 . A food package comprising: 
 a body portion and    a bottom portion having: 
 a first layer comprising an oil and moisture absorbent substance and  
 a second layer covering a top surface of the first layer, the second layer comprising a formulated olefinic polymer.  
   
     
     
         85 . The food package of  claim 84 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         86 . The food package of  claim 84 , further comprising a third layer covering a bottom surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         87 . The food package of  claim 84 , wherein the oil and moisture absorbent substance is paperboard.  
     
     
         88 . The food package of  claim 87 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         89 . The food package of  claim 87 , wherein the paperboard has a Hercules Sizing Test value of not more than about 350 seconds.  
     
     
         90 . The food package of  claim 87 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         91 . The food package of  claim 87 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         92 . The food package of  claim 87 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         93 . The food package of  claim 84 , wherein the second layer comprises a film.  
     
     
         94 . The food package of  claim 84 , wherein the second layer comprises an open celled foam structure.  
     
     
         95 . The food package of  claim 84 , wherein the formulated olefinic polymer comprises a blend of formulated olefinic polymers.  
     
     
         96 . The food package of  claim 84 , wherein the formulated olefinic polymer is blended with a low density polyethylene.  
     
     
         97 . A food package comprising 
 a body portion and    a bottom portion having a single layer comprising an oil and moisture absorbent paperboard.    
     
     
         98 . The food package of  claim 97 , wherein the oil and moisture absorbent paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         99 . The food package of  claim 97 , wherein the paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         100 . The food package of  claim 97 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         101 . The food package of  claim 97 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         102 . The food package of  claim 97 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         103 . A food package comprising an oil and moisture absorbent package material, the package material comprising: 
 a first layer comprising an oil and moisture absorbent substance and    a second layer covering an inner surface of the first layer, the second layer comprising an oil and moisture repellent substance having a multiplicity of perforations to allow oil and moisture to pass from the second layer to the first layer.    
     
     
         104 . The food package of  claim 103 , wherein the first layer comprises a multiplicity of sublayers.  
     
     
         105 . The food package of  claim 103 , further comprising a third layer covering an outer surface of the first layer, the third layer comprising an oil and moisture repellent substance.  
     
     
         106 . The food package of  claim 103 , wherein the first layer is paperboard.  
     
     
         107 . The food package of  claim 106 , wherein the paperboard has a density of not greater than about 7 g/cm 3 .  
     
     
         108 . The food package of  claim 106 , wherein the paperboard has a Hercules Sizing Test value of less than about 350 seconds.  
     
     
         109 . The food package of  claim 106 , wherein the paperboard contains an additive to increase the oil absorbency of the paperboard.  
     
     
         110 . The food package of  claim 106 , wherein the paperboard contains an additive to increase the moisture absorbency of the paperboard.  
     
     
         111 . The food package of  claim 106 , wherein the paperboard has indentations to increase the oil and moisture absorbency of the paperboard.  
     
     
         112 . The food package of  claim 103 , wherein the second layer is a polymer film  
     
     
         113 . The food package of  claim 112 , wherein the polymer comprises a blend of polymers.  
     
     
         114 . The food package of  claim 112 , wherein the polymer is a low density polyethylene.  
     
     
         115 . The food package of  claim 103 , wherein the multiplicity of perforations is created using a knurled roll.